SQL>
SQL> SET ECHO ON
SQL> SET SERVEROUTPUT ON
SQL> DECLARE
2 a VARCHAR2(30);
3 b VARCHAR2(30);
4 c VARCHAR2(30);
5 BEGIN
6 c := 'AAA' || ' BBB ' || ' CCC ';
7 DBMS_OUTPUT.PUT_LINE(c);
8 END;
9 /
AAA BBB CCC
PL/SQL procedure successfully completed.
SQL>